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  • 1
    Digitale Medien
    Digitale Medien
    [a]-Anellated carbazoles with antitumor activity: Synthesis and cytotoxicity (1996)
    Springer
    Monatshefte für Chemie 127 (1996), S. 97-102 
    Details
    ISSN: 1434-4475
    Schlagwort(e): 3-Vinylindoles ; Carbazoles ; Diels-Alder reactions ; Cytotoxicity
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Chemie und Pharmazie
    Beschreibung / Inhaltsverzeichnis: Zusammenfassung Die aus den methoxysubstituierten 3-Vinylindolen1 und2 zugänglichen Cycloaddukte3,5 und7 lassen sich mitDDQ zu den coplanar-anellierten Carbazolen4,6 und8 dehydrieren. Verbindung4a, die auch durch eine Röntǵenstrukturanalyse charakterisiert wurde, zeigt signifikante Cytotoxizität gegen Humantumor-Zellinien (K562 und RXF93).
    Notizen: Summary The cycloadducts3,5, and7, readily available from methoxy-substituted 3-vinylindoles1 and2, were dehydrogenated withDDQ to the coplanar [a]-anellated carbazoles4,6, and8. Compound4a, also characterized by X-ray structural analysis, shows significant cytotoxicity against K562 und RXF393 human tumor cell lines.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00807414
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  • 2
    Digitale Medien
    Digitale Medien
    Tumor-promoting activity and cytotoxicity of 3,4,3′,4′-tetrachlorobiphenyl on N-nitrosomorpholine-induced murine liver foci (1989)
    Springer
    Journal of cancer research and clinical oncology 115 (1989), S. 247-252 
    Details
    ISSN: 1432-1335
    Schlagwort(e): N-Nitrosomorpholine ; 3,4,3′,4′-Tetrachlorobiphenyl ; Tumor promoter ; Cytotoxicity ; Mouse hepatocarcinogenesis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Effects of 3,4,3′,4′-tetrachlorobiphenyl (TCB) on glucose-6-phosphatase (G6Pase)-altered hepatic foci of N-nitrosomorpholine (NNM)-treated B6C3F1 mice were investigated. TCB was chosen as a selective 3-methylcholanthrene-type inducer and tumor promoter. To initiate hepatocarcinogenesis, mice were treated with NNM (160 mg/l, in drinking water for 7 weeks), as in previous studies with the rat model. After a treatment-free interval of 22 weeks, TCB was administered (5×50 mg/kg, every 3 days), and liver foci were analysed 10 weeks after the start of TCB treatment. Unexpectedly, the number of G6Pase-negative and-positive foci per liver was markedly diminished following TCB treatment (to 32% and 57%, respectively). On the other hand, the mean volume of the remaining G6Pase-altered foci was enhanced, owing to an increase in the percentage of foci of large size (〉0.5mm2). Throughout the experimental period of 39 weeks prolonged liver injury due to NNM and TCB treatment was demonstrated by histology and by elevated serum levels of glutamate-oxaloacetate transaminase. The results suggest that (in contrast to the rat system) TCB exhibited opposing effects on liver foci in the mouse model: (a) moderate tumor-promoting effects and (b) cytotoxic effects in NNM-injured liver, leading to decreased numbers of liver foci.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00391697
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  • 3
    Digitale Medien
    Digitale Medien
    Andreev-reflection in highly doped Pb/n−InSb/Pb junctions (1993)
    Springer
    The European physical journal 92 (1993), S. 187-190 
    Details
    ISSN: 1434-6036
    Schlagwort(e): 74.50
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We studied the carrier transport through n-InSb-films sandwiched between two superconducting lead electrodes. These n-InSb-films were about 30 nm thick, polycrystalline and very highly doped (1021 cm−3). TheV(I)- and dV/dI (V)-characteristics indicated all the properties of Andreev-reflection (subharmonic energygap structures (SGS) and excess current) according to the theory of Octavio et al. (OTBK-model) [1, 2]. Our measurements show the temperature dependence of these structures and also the influence of magnetic fields up to 80 mT and give a further reference to the importance of Andreev-reflection in semiconductor-coupled superconducting junctions (SSmS junctions).
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01312175
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